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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7368d3c7deeea4457b22eff4ca92d2090a4efe3fbaa52e67b258b15b896731' 
  AND token = '8c5TVXDZKJ7ANm/3KB9NVW2W6wXe92Pl9p20cncwhak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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