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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93b314574f639638e0fcbfe33a0af64652f150b80814cd42fcb8ad74cd5c0d5' 
  AND token = '3za4Np4m55XbHHsIIElvKrTwsjyfrS+W1MxIYc0EbGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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