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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f9cdd38d4cfa143263e77563f78f7af5482ffe664124bd678f67b1a05977c9' 
  AND token = 'cLt+ef6t73ynl8qu1xm5raHYjxSeUDibo8IpBLx2Zrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}