SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6412f57392fbdb0683ce6c05e1f2559279880632a1721b453f833ae2fecd6405' 
  AND token = 'VdpeAP8XEDuJUj28XTZfw/3r4sDGew8llWgzlu8mLhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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