SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb388d52397ca97d0330e4e071aff03342a2b9c1fe90ab165cd6313a6600e00' 
  AND token = 'gOz+gJ4ADYNdiGKgKA/MgxZTbehwmjXfnPc8R+Z87zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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