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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fae9afd8fa2bd64e9d1f9eadfdfeb1ce75cce353e1005b5ab58c51228ef615d' 
  AND token = '4DUye+ZrflkJd9vmBouZKFclxN9kgcsbbcFAiOebXHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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