SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c67bb1684e6b88a0b1124b7e55105ac6e980641ce827de786f77c56ce29cca' 
  AND token = 'JGsNj0Jw2vgX1C/Lv6DBWwfYHqmucnDXKnPmxqNpBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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