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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82843ea4fd94ad99a47098df36f91ffc28c71981e757f56a6f08864046910f18' 
  AND token = 'yRwdqX93KsEEMERD4Tqoki9jJ68FGwgKYd1kFv21PYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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