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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5178c92776f93fbb86c882054dd28887439a9685865dc3e1a57f6d93b03523' 
  AND token = 'KhuG1DCQ3PnyUu4Yg4tLqrHq5FMgg0RCX6TyEzp2204=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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