SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d446b83b33f2b3ec6650680cd9eb5a966f481678c6e7bc74d11324b22259f7' 
  AND token = 'x/U+78uJORDMLzPbF+yQiLOMwZt9gfmkYvmCBChYlwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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