SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088087dee632f3aca0d678d5f2648cc8db1cfccfdde71d3f41d5215f1b55156f' 
  AND token = 'gJvLre6kjhRVLnUCK7MzSHBVxXwpDhXxlMbjY3/tcCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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