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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5ea58e4d54f66b9bb5f636438b66fece46f4d2fcea2b99292ea2ee790a7d2e' 
  AND token = '8vqCbZTFwfQS4nExnLZ+yHhSgFuBw0hX97J6jS6TFvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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