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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1bc58325aadac775d99b6291ba65223c2ad81fd30cdcff705478ecc2f02674' 
  AND token = 'xerseGvp8NiLW/QtsJaLYDFuPliM4BBa6BogMN3eoM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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