SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b17144b1944c46017c3aba5c69f8fb923d9432f8eaae3a01daf0d8a7d24748' 
  AND token = 'HFMmZqs+B8K9KSTRncXJClSVQmBtv9PyRArZYazG8dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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