SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb58d4f82f7447313deb56313854dadc6bab1d3157bb69667332b5899b670dea' 
  AND token = '58FZAmZlZe1pkD/IvQGdhP531k+YlWJm9YnUiY4V/FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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