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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4936a95dd391e9d7dfa008f5e31e5bd6691fca05db1d90aca1ad240adb50c3' 
  AND token = 'jKUw6OSBbn/msZZyeGxJvN2nr1iqNPcC9Y/e7PtqfGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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