SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56145757c1a5c1af80a25978763ea2862b2e5e91fdcd9a031125c04dfdd87f2a' 
  AND token = 'hqJ+IDwz5IAKwHfuUy3VRPZA9w3dsNh03zQlAoaHGgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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