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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a026b2cbfb05ce2015cdb13a0aefb3ac697dbeab76bb8d12c29426b180b51483' 
  AND token = '5IMiLsE16lXOCl+2VAg63+KUGYoVyPovD2G6KjErnlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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