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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a031ff34b413a55bd13053f79c8663275f2e296339996af7ddbd4a12c06ba53' 
  AND token = 'LusU25ggqcZnURNDm8ZoPj93LF2k6a8J9lOcIU0Y+7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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