SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405d72884b6597e468f51daa95bea4c8921d7f5176e35b9435ec6af2de5c9163' 
  AND token = 'Km1/ujB7DWKXY6l/ntpjuE7aCccPYZY/jSvIbu7Fx6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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