SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cb786757e56fb2cf2db65abef759d23ef1fc34d60b8bd2c221e8a97823bab8' 
  AND token = 'o9SMlKHym8pC1mzSYPYqmjhz+tBsQyuIpedMW5vOG5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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