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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf58fe4ec1a5019a1941372c339d26de0ab28c7c63c25c73562b5cc7ce76f8dd' 
  AND token = 'e7kyPQ48ioiJVVQlE81+HtqmeTVzm1uhLKTbYXeAYOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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