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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e308962ec8e5ce8c46a510b57204d2ea4172128a5573e256a9a37e0fe91b08' 
  AND token = 'R4fX6gtp1mojH9ru2awSB6lRvXqVAuZSiRFbZkordkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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