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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f1495bd73020a59e6f7689a793c227dfd9c1b6f329908e3e42f95a3059583e' 
  AND token = 'ykELqq+acjLwW5Lb8hwgDkecoi6NF/GghWLypKcg/tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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