SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5215eb223609d849f5f2da9a46f6b4f9ed827cfd2ab6de6b59467af8c7354cab' 
  AND token = 'w5rgfz+WtJxhfrIA9smGq6KAfQVHqevC/WHw+Fp0GkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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