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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f22ed4f2dff5b49eaa5d8e80aef6e9ff6ed0e0fa04f1c050adbd3b1136bd64' 
  AND token = 'bm0MR6Ln7ddn0MljTd9tODga1EJRc0o+cnEkYbTHkxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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