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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94745d8ea8f8afd752425e99b0e954e98db4547b476520244a597cbbce876172' 
  AND token = 'ZY6T6jtbaCjUC4EeXRQguFgz++oOEvKU7rGk8aPLnqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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