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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4b25755ef8e2ed4b2886068012ef8655e3279bdd479efb710497267ed32ba0' 
  AND token = 'WxaTPiMsSplAJi6pz8ZU8kjXOVSDzIvbZx8pmny5pFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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