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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0eeea095c57b8047afa3e76af22ba38bb1609b5098e6cbffebbe1c479a9210e' 
  AND token = 'WTti2fDy8NlY/THLelvdxs8G7kdPSj9ZOm0GBeHtVes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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