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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd27c52302cf0afa4b86765060dbaf2cbc5501487644ced3c08dbd73dab09f77' 
  AND token = '3xBk8WrE7nUQzvPHdLk5fHdjIzFD43WN+/Ok08RGwVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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