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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaed32eeedba38a90ce0759c58fe8e8a233486551f6ae13b3f961c7f96b3d00' 
  AND token = 'UGnAwt5/kMyWCVZPdURO0vQBmlGygQMroIYipAwenNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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