Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdefe37554b2033207b2b555013d1120e4e83e14e0e1bc1f346fbe11af29a335' 
  AND token = 'jjLpRYX5UZ1Gj9UI5aYxKdRfHhXqtM4Q2R01Hgb9IOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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