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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86ce495d67f098855791a621c991c902b8e89b654e034a43af39dde7c757018' 
  AND token = 'bjAjf9gA9/9bzExe6IewOlgTWWB4EKtECnE38fvi85s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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