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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0772c39c3672a4eb4262aa61f09b39a2ebfe61238720ddb9ce06ca07fd3d0b0' 
  AND token = 'FIph7pruLDlvvm+ZByDW9M3GtaNkQQ4rxlsbvFMOvH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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