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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d76d40fb9740887af2a6cb24fc4456e73ad26f94fb0ba7a69ee6f1654adfa6a' 
  AND token = 'J1KCVu3ZPUtS3XkZR0Tw+3NHSudJMWRFYfDJIaY0vUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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