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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8920716dbe76642a6f225aba436e9e455b1dfd4df499863b62ee502fe32e9a80' 
  AND token = '61P9jMHxh6wMqA4BnEcDfnM9pfeeAy8mtJ4JJNZKomI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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