SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057353569971c2049f67be7c6b85eb85acda2b2ff9daf70e5187da4e7b9529e2' 
  AND token = 'mIF+q33KWBLngsFp6LYPEftEujyUcBzJPyr8f5sNzgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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