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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c58b49c9fa58a6ed8af171d7a3eb86cf39cabcb39d28c12e913c6a9191e66f8' 
  AND token = '576yxIhGCMh5OMCgffuM8vDYcQOXxzQzrG81QPJN7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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