Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5121948ab3681de209b44f3de1de5a0345cfaa83ca70da2ba219f5eb42954083' 
  AND token = 'HQTX+b15RBITMjILqRomJ2Y6Fc9NImqi3gxQ3+4FnkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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