Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917ef57460ee41504e27b4cf62e1b89febaccea0987b555c5bca08397190db83' 
  AND token = '/U+jascEAokaB2X6sMIqtp/KSFcFcHuaF9WY1MuTJWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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