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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c017bab4c2d4ce5da7bebb9e955ef8868ad999378cbcaa3ab8ab1c35126dca9' 
  AND token = 'PQmjsT9SeiKRxzaoBkqUXtg4wceV7KfIhD8gZ3mqjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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