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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e43750e9efd7faa4782e769ef178c4a769d0d90bc5d7b0fda4472eb8e05de7' 
  AND token = 'ieAcZ5FuWQ1TzKSfE6YUrlYG54yPE1qgPaBUuLcMxoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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