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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c992ae9071eb08d83733f8b3df5ccb8b7d9623c2bf8cd5a9691c9bdeb1ad61' 
  AND token = 'ieR+J2xhNQBkgKsK0Qb3hcDlFltwqzoj/yEiyMyBLkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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