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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bd957e8b5ea8147adb1bb606561a4d8f9c68f6f37a6e5607675d46f941d2ef' 
  AND token = 'PAUbSvBsfUCFIo5FzWjhm05HZGi8bNn99/8UNSIsoTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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