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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca97e3bcb56fa05bba22c1f0d013a3308f94026702309a6e91da18a31997427' 
  AND token = 'CUSaCfNU7sGeYfHqUuU7+ZAmEhcKNUlK10nn8/5Fkds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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