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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ebec914cff81c8f8cea5004a8f83112dd9bb446cf1caf1799c794d9dbdc90d' 
  AND token = 'l1Ur6QB2XIXs5/nV1F8BIGMujJM0JH5HItd27AQQcvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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