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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b1fd43756120749ed09af9790d2848714de358388dbe6a04c19b1b32640642' 
  AND token = 'q8deYyJ/G+nhI4vcDTEWWt8OrG5fEwO88BTdAfmR7zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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