SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebee7abbfd03b2491c9f8278db5bba3b894354b6a4ab579749611de02f9096bd' 
  AND token = 'qIJ+TUjH0S6Eu+XJSzYGkFIuz91VxKdiZTJv6IerOco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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