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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb0d1427b91a984fd92a85cab34d4c79ea84f19844efab91ef10eee84d18b3b' 
  AND token = 'OsrhDFuzV96XEKuIu27/1cji2w5vtSEN4vmKfkkKCCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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