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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9d96bb2eb8a8cf3fd5de84460f213e49df6d77e441f48338ec7657d69965ac' 
  AND token = 'JZSnmYYHgUeQHzEbS2M+HN+WylkdIlpcPkse8pixWtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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