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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6537725ee86da72f1d08ce3d4239ca0c35677730e679104f4c394c5212c37b' 
  AND token = 'eZ3XiIhbDc2+aOqCQYNOlOS8xCLFz8I2Zju54x07M5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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