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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24cfd8a981e73dc69a48e9193f9ef45cd451dfe146c2f604be6089efc084d74' 
  AND token = '2IH+vE2hAwhYwAQkBeSzuME4l4e2Ez1mArz7NlawbIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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