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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c6aef143673e1358c69603fa98c5943e8a02a9ccefd57aca4773fa7a55d74f' 
  AND token = 'ly6msRaN9h9Spbpi74o9sDxmkxK0FKBMxBHkG4zwr/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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