SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f63be130c922e2a3e3cbf1a5c180819142ad6e599f52c81257438ac70b5b8eb' 
  AND token = 'OINxFD8u+tw9H2FQ4qjJK2hp6vwiuyRgRk80lzznZaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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