Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b159f5eac0e91c016165b228d688b6deb2a5fb51049d495b8417c63d40ae11' 
  AND token = 'fsY2PhwwQt8OlwGQyMo+lZud/L2l77cg7GClDWCtNBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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