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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b967bf1d68db125ebd3256846fbd83f389afd6ce8f0e656d109d082af3f7af2b' 
  AND token = '9JJBxJqrHyNT0L3FkmVxtzegLFl6Ytluty1QX3KVABg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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