SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28acd59dc4987f84a63835d908a74ba6cc72213458efffb5e9145f814bca458' 
  AND token = 'vnGWwYwSCK+IEyHJTArmFyo1gCjPgtubAe2GXha4+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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