SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86723445f22d05c1abcbd0cbcb7356dd4113032928e32032a5a8b6dbfb449fd' 
  AND token = 'qWbHKIB7twZdfC5R92/E6GuIQSygY2LAudqTxmjhC3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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